Question

A car of mass m = 1100 kg, moving with a velocity of 22.0 m/s, skidded off the road hitting a tree that brought the car to rest in 2.0 s. Determine

**(a)** the impulse J imparted to the tree.

**(b)** the average force that acted on the tree
during collision.

Answer #1

a) Impulse is defined as a change in momentum (occur due to collision)

Here
= 0, and
= 22.0 m/s, and * m* = 1100 kg

So the impulse J= -1100*22= - 24200 kg m/s

Impulse is a vector, so a negative impulse means the net force is in the negative direction.

b) Also, impulse can be defined as

So average force

= 12100 N

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